Air-compressor.



W. REAVELL. AIE GOMPRESSOR. APPLICATION FILED JULY 12, 1909.

1,070,733. Patented Aug. 19, 1-913.

3 SHEETS-SHEET 1.

'WITN ESSES: INVENTOR:

W. REAVELL.

AIR COMPRESSOR.

APPLICATION FILED JULY 12, 1909.

1,070,733. Patented Aug. 19, 1913.

WITNESSES: INVENTOR:

W. REAVELL.

AIR COMPRESSOR.

3 APPLICATION FILED JULY 12, 1909 1,070,733. Patented Aug. 19, 1913.

3 SHEETS-SHEET 3.

WITNESSES: INVENTOR:

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inverse when ana use seen-nine 1 0 all whom it ma concern; I. Be it anew-rai I, Wnmmn; Bpavpnn, pit ps i h; in 1m o t el Ra lan. r a ate a e aie ws s I i' ias t e M 1 t sers Wh nt th o owln s a spec fic ion, reiepence being ha to he accompany ng dr wings.

My WPYOYQIIIQM is PW' Q M Y Pre i h e set e a e sd rah n e e t ann N erreratus des gned for clean ng ynamos, trans formers, switch-board instrnn ents, etc by means of an air blast, and, my improvement includes mechanical means for obta n ng reciprqcatory motion from the rotary motor armature shaft within a dust-proofcasing containing the cylindrical pump chambers.

n5 hereinafter described my invention inc udes a rotary shaft which maybe either directly or indirectly connected with the armature shaft; a pump plunger arranged to reci rocateat right angles to the axis of said s aft; and aslide block, operatively connecting said crank and plunger and mounted to reciprocate in said plunger at right angles to the latter. {is hereinafter described said means for converting rotary motion into reciprocatory motion 1s embodied in two pumps, both double acting.

However oneisarranged for simple compression, but .the other is arranged for twostage compression.

My invention. includes the various novel features of construction and arrangement hereinafter more definitely specified.

In the drawings :Figure I is a longitudinal sectional view of a double acting pump embodying my invention and adapted or simple compression of air. Fig. II is a transverse sectional view taken on the line II, II in Fig. I. Fig. III is a longitudinal sectional view similar to Fig. I but showing a modified form of my invention adapted fortwo-stage compression of air. I

Referring to the form of my invention showntin Figs. I and II; the casing 1 has the bearing 2 for the shaft 3, which may be directly connected with the armature shaft or as shown in Fig. II Said shaft 3 may .be provided with means detachably connecting it with the sprocket wheel 5, and thus adapt ed to be connected with the motor shaft by a chain. As shown in Fig. 11; said shaft 3 is prevented from longitudinal displacement by the set screw 7, extending through said casing 1 and having its reduced end .8

the crank 16 which is fitted in the cylindrical bearing in the slide block 18, and, said ,block 18 is fitted to slide in the cylindrical bearing 19 the reciprocatory plunger 20, which as shown in Fig. I has its opposite ends fitted to reciprocate in the counterpart pnmp chambers '22 which are oppositely alined in said casing 1. Each of said chamhers 22 has a removable cover 25 containing the air inlet port 26 controlled by the ball valve 27 which isnormally pressed by the spring 28 to close said port 26. Said valve 27 and spring 28 are carried'by the removable screw threaded plug 29, which is fitted in the corresponding socket 30 in said cover 25. Said chamber 22 is provided with the outlet port 32, controlled by the ball valve 33 which is normally pressedby the spring 34 to close said port 32, which opens fromsaid chamber 22 into the by-passconduit 36, having the discharge outlet 37 for the compressed air, which is delivered from said chambers 22 in alternation. Said valve 33 and spring 34 are carried by a removable fipeoiiloatlon o t Letters Patent. Au g 19,1913

e flange 10 on said shaft projectscrew threaded plug 39 which is fitted to the corresponding socket 40 in said casing 1. In order ,to permit the escape of air from saidyconduit 36 under abnormal pressure, said plug 39 is provided with the safety vent 42, controlled by the ball valve 43 normally pressed by the spring 44 to close said vent; said ball 43 and spring 44 being carried by the removable screw threaded plug 45 fitted in the corresponding socket 46 in said plug 39. It is to be understood that by the rotation of said shaft 3 said plunger 20 is reciprocated in said pump chambers 22 so as to take air in one chamber through the port 26 leading thereto, and contemporaneously discharge compressed air through the outlet port 32 of the other chamber; the air thus alternately compressed in the respective chambers being delivered through the common outlet including said conduit 36 and outlet 37. i

The form of my invention shown in Fig.

III includes the casing 51 which is constructed and arranged at the right hand end like the embodiment of my invention shown in Fig. I including an inlet valve 53 and outlet valve 54 for the pump chamber 55, constructed and arranged like the valves 27 and 33 above described. However, the

conduit 56 conducts compressed air from said chamber 55 to the opposite pump chamber 57 and may be termed a by-pass conduit, from which the air compressed by two stages is finally dischargedfrom the port 58 controlled by the ball valve 59 which is normally pressed by the spring 60 to close said port 58. Said valve 59 and spring 60 are carried by the removable screw threaded plug 61, which is fitted in the corresponding socket 62 in said casing 51. The compressed air discharged from said outlet 58 under control of the automatic valve 59 is directed through the discharge outlet 64:

which may be manually controlled by the valve 65. It is to be understood that ifv the pump shown in Fig. III continues to operate when said valve 65 is closed, or said conduit 56 is otherwise charged with air at abnormal pressure, a safety vent for the same is afforded by the port 67 under control of the valve 68 which is similar to the valve 43 above described.

The form of my invention shown in Fig. III operates as follows :-The piston being moved toward the left hand side of Fig. III, air is admitted by the inlet valve 53. Assuming that the chamber 57 was filled with air at ordinary atmospheric pressure, said air is compressed into the clearance space at that end of the cylinder and into the conduit 56. Assuming that said clear-' ance space represents 25% of the cylinder volume; the pressure of the air thus compressed would be raised to seventy-five pounds absolute. The piston then being moved toward the right hand side of Fig. III, the air which was aspired at the valve 53 during the previous stroke is compressed while the airin the aforesaid clearance space of the chamber 57 and conduit 56 expands behind the receding piston until the pressure at opposite ends of said piston is equalized at twenty-five pounds absolute. Thereupon, the valve 54 o ens and during the remainder of said 'stro (e of the piston the compressed air inthe chamber 55 is forced into the conduit 56 and chamber 57, and, at the completion off said stroke the air thus compressed is at a pressure of twentyfive pounds. Said piston being then moved toward the left hand side of Fig. III atmospheric air is again admitted at the valve 53 while the air in the chamber 57 and conduit 56 is further compressed, so that, on the next return stroke of the piston the pressures at the opposite ends of the cylinder 7 must balance at a higher pressure, viz ;'thirtyfive pounds, and, such operation continues until a pressure is reached which is the desired delivery pressure capable of opening the valve 59. Assuming that said delivery pressure is one hundred and five pounds absolute, the volume of air delivered at that pressure would be; the volume swept by the piston multiplied by fifteen and divided by one hundred and five.

It may be observed that in both forms of my invention above described the slide blocks not only serve to operatively connect the rotary shaft with the reciprocatory plunger but also serve to automatically lubricate the latter by dipping into and raising the oil in the casing.

I do not desire to limit myself to the precise details of construction and arrangement above. described, as it is obvious that various modifications may be made therein without departing from the scope of the appendedclaims.

I claim 1. In an air compressor, the combination with a casing having cylindrical air chambers at respectively opposite ends "thereof, a crank chamber between said air chambers, a conduit connecting said air chambers, and a discharge outlet from said conduit; of a cylindrical piston plunger of uniform diameter throughout its length, mounted to reciprocate in said casing and alternately compress the air insaid chambers; means arranged to, reciprocate said plunger comprising a cylindrical slide block mounted to reciprocate in said plunger transversely with respect to the plunger axis, a crank shaft extending transversely with respect to said plunger axis, and a crank on said shaft fitted in said slide block in said crank Chitin her; a spherical air inlet valve opening inward 'and'controlling the admission of anto one of said chambers; a spherical air outlet valve opening outward and controlling the emission of air from the same chamber to said conduit; a spherical safety vent valve in concentric relation with said outlet valve controlling the escape of air from said conduit to the atmosphere, a spherical discharge valve opening outward and controlling the-delivery of compressed air from said. conduit; and, s rings operatively connected with each 0 said valves, normally maintaining the same closed; whereby, a greater pressure is required to operate said vent valve than any pf the other valves, and,

a greater pressure is required to operate said discharge valve than said outlet valve, and, two stage compression is effected.

2. In an air compressor, the combination with a casing having cylindrical air-chambers at respectively opposite ends thereof, a crank chamber between said air chambers, a conduit connecting said air chambers, and a discharge outlet from said. conduit; of a cyciprocate in said casing and alternatelycona press the air in said chambers; means arranged to reci rocate said plunger compris ing a cylindrical slide blockmounted to" ciprocate in said lunger-transversel with respect to the plunger axis, a crank shaft ex.- t'e'n'ding transverse y with respect to said plunger axis, and'a crank on said shaft-fitted in said s'lideblock in said'crank chamber; an

automatic air inlet valve opening inward and controlling the admission of air to one of said chambers; an automatic air; outlet valve opening-outward and controlling the emission of air from the same chamber to said conduit; an automatic safety vent valve in concentric relation with said outlet valve controlling the esca of air from said conduit to the at-mosp ere; an automatic discharge valve open ng outward and eontr'ob ling the delivery 0 compressed air from said conduit; and, s rings operatively con nected with each said valves, normally maintaining the same closed; whereby. a greater pressure is required to operate said vent valve than an of the other valves,- and,

, a greater pressure 1s required to operate said dischargevalve than said outlet valve, and,

two stage compression is effected.

3. In an air compressor, the combination a with a casing having cylindrical air chamhers at respectively oppositeends thereof, a crank chamber between said air chambers, a conduit connecting said air'c hambers, and a discharge outlet from said conduit of a cylindrical piston plung'er of uniform diameter throughout its length, mounted to reciprocate' in said casing and alternately compress the air in said chambers; means arrangedto reclprocatesald plunger comprising a cylindrlcal sl de block mounted to reciprocate in said plunger transversely with respect to the plunger axis, acrank shaft extending transversely with respect to said plunger axis, and a crank on said shaft fitted in said slide block in said crank chamber; an'automatic air inlet valve opening inward and controlling the admission of air' to one of said chambers; an automatic air outlet valve openin outward and controlling the emis slon of air from the same chambefto said conduit; an automatic safety vent valvecontrolling the escape of-air from said conduit to the atmosphere; an automatic dischar e valve opening outward and controlling e delivery of compressed air from said conduit; and, springs operatively connected with each of said valves, normally maintaining the same closed; whereby, a eater pres sure is required to operate sai vent valve than any of the other valves, and, a greater pressure is required to operate said dlscharge' 'valve than sa'rd outlet-valve, and, two-stage,

i compression is efiectedfl l wean "if'clisihg Having cylindrical air chain-- at respectively opposite ends thereof, a cra k chamber helli'vl eel'l said air chambers, a conduit connecting-said air chambers,and a .dischargeoutlet from said conduit; of a cylindrica pistonplunger of uniform diaman "throughoat itslength, mountedto recipmeats in said casiu and alternately compress the air in sai I chambers; mea'ns arranged to reciprocatesaid plunger comprising a cylindrical slide Blockmounted -t'o re-' ciproc'ate in said plunger transversely with inspect to the plunger axis, a crank shaft extending transversely with respect to' said plunger axis, and a crank on said shaft fitted in said slidehloc'k insaid crank chamber an automatic air inlet v'alve opening inward and ccntrollin the admission of air to one of said cham er's"; an automatic air outlet valve outward and controlling the emisslon o air' from.=the same chamber to said conduit; an automatic discharge valve opening outward and controlling the-delivery of compressed air sai 1e springs .operativ'el'y connected with each of said valves, normally maintaining the same closed; whereby, a greater pressure is re quired to operate said discharge val ve than said outlet valvaand, two stage compression is efl'ected. g 5. In an air compressor, the combination with a casing having cyl ndrical air cham bars at respectively oppo t'e' ends thereof, a crank chamber between said air chambers a conduit connecting said air chambers, an a discharge outlet from said conduit; offa cylindrical piston mounted, to reciprocate m said casing and alternately compress the air in said chambers; means arranged toreciprocate said 'iston comprising acra-nk in sand crank chem er; an automatic air inlet valve controllin the admission of air to one of said chame'rs; an automatic air outlet valve controlling the emission of air from the same chamberto'said conduit; adischarge nduit; and,

valve controlling'the delivery of compressed air fromsaidconduit; and, s rings operatively connected with each 0 said valves, r

.a conduit conn'hctin said air chambers, and a 'a discharge outlet-- rom said conduit; Ufa piston mounted to reciprocate in saidcasin and alternately compress the air in set" chambers; means arrangedfto reciprocate said piston comprising acrank in said :crank chamber; an air inlet valve controlling the admission of' air to one of said -taining said valves closed; where y, said ed to reciprocate in said casin and alterdischarge valve is opened at a greater pressure than said outlet valve, and, two stage compression is affected 7. In an air compressor, the combination with a casing having air chambers at respectively opposite ends thereof, a conduit connecting said air chambers, and a discharge outlet. from said conduit; of a piston mount.

nately compress the air in sai chambers; means arranged to reciprocate said piston;

an air inlet valve controlling the admission of alr to one of said chambers; an air outlet valve controlling the emission of air from the same chamber to said conduit; a dis charge valve controlling the delivery of cdmpressed air from said conduit; and, means normally maintaining said valves closed; whereby, said discharge valve is pened at a greater pressure than said out letcvalve, and, two stage compression is effected;

, 8.1.11 anair compressor, the combination with a casing having cylindrical air chambers atrespectively opposite ends thereof, a crankchamber between said air chambers, a conduit connectin said air chambers, and adischargc outlet .rom said conduit; of a cylindrical piston plunger of uniform diameter throughout its length, mounted to reciprocate in said casing and alternately compress the air in said chambers; means arranged to reciprocate, said lunger comprising a cylindrical, slide bloc mounted to-reciprocate'in said plunger. transversely with respect to the plunger axis, a crank shaft extending transversely with res ect to said lun er, axis, and a crankon sai shaft fitted msa'idslide block "in said crank chamber;

an automatic air inlet valve'opening inward and controlling the admission of air to one ofsaid'chambers; aniautomatic air outlet valve opening outward and controlling the emission of air from the same chamber to, said conduit; an automatle safety ventvalve' lnconcentric relationwlth sal'doutlet valve controlling the escape ofair from said con: dint to the atmosphere; and, s rings operatively connet bed with each 0 said valves,

normally maintaining the same closed;

whereby, a greater-pressure is required to operate said ventvalve than any of the other valves. p

9. In an aircompressor, the combination with a casing having cylindrical air chain'- hers at respectively opposite ends thereof, a crank chamber between said air chambers, a conduit connectin said air chambers, and a discharge outlet groin said conduit; of a cylindrical iston plunger of uniform diameter throng out its length, mountedto reciprocate in said casing and alternately compress the air in said chambers; means arranged to reciprocate said plunger com rising a cylindrical slide block mounts to reciprocate in said plunger transversely with respect to the plunger axis, a crank shaft extending. transversely with respect to said plunger axis, and a crank on said shaft fitted in said slide block in said crank chamber;

an automatic air inlet valve opening inward and controlling the admission of air to one of said chambers; an automatic air outlet valve opening outward and controlling the emission of air from the same chamber to said conduit an automatic safety vent valve controlling the escape of air from said conduit to the atmosphere; and, springs op eratively connected with each of said valves,

normally maintaining the same closed; whereby, a greater pressure is required to operate said vent valve than any of the other valves,

10. In an air compressor, the combination with a casing haying cylindrical air chambers at respectively opposite ends thereof, a crank chamber between said air chamhere, a conduit connecting said air chambers, and a discharge outlet from said conduit; of a cylindrical piston plunger of uniform diameter throughout its length, mount ed to reciprocate in said casing and alternately compress the air in said chambers; means arranged to reciprocate said plunger comprising a cylindrical slide block mounted to rec1procate in said plunger transversely with respect to the plunger axis, a crank shaft extending transversely with respect to said plunger axis, and a crank on, said shaft fitted in said slide block in said crank chamber; an automatic air inlet valve opening inward and controlling the. admission of air to one of said chambers; an automatic air outlet valve ,opening outward and controlling the emission of air from the same chamber to said conduit; and, springs operatively connected with each of. said valves, normally maintaining the same closed. 4

In testimony whereof,- I have hereunto signed my name at New York city, N. Y., thls twenty-second day of June, 1909.

r WILLIAM nnavnnn Witnesses:

EUGENE P. TERRY,

DU NCAN Y. GAMPBELL. 

